- created a branch to switch TclList from a PMC to a class. 'make test' works, but 'make spectest' has many regressions. Goal is to avoid crossing the PBC/C boundary quite as often, nice side effect of having the code more readable in PIR.

That was when I started to work on moving contexts into PMCs, but that was also proving to be far more of a pain than I had time to deal with (given that I had already spent 50+ hours on the lexicals problem in the first place)